Improvement in machine for sand-papering moldings



NAPETERS FHDYO-LITHOGRAPHER. WASHINGTON D C intml (Setting @aient dtjijlire.

FRANK Gr. CHAPMAN, OF CHIOAGQILLINOIS, ASSIGN'R TO DENNIS BEACH,

OF SAME PLAGE.

Letters Patentk N 103,717, dated May 31, 1870.

IMPROVEMENT IN MACHINE FOR SAND-PAPERING MOLDING-S.

The Schedule referred to in these Letters Patent and making parl: of the same.

To all/whom 'it may concern:

Be it known that I, FRANK G. Cnarnmmof .Ghicago, in the county of Cook and Stat-cof Illinois, have invented a new and useful Machine for-Sand` Papering Moldings; and I do hereby declare the following to be a full, clear, and exact description thereof', which will enable others skilled in the art to which my invention appertains to make and use the same, reference being had to the accompanying 'drawing forming part` of this specification.

means for sand-papen'ng moldings; and to this end,

It consists, first, in so constructing a sand-paper holder that, when the sand-paper is placed within it, the latter shall conform to the angles of the molding to be polished, for the purpose of preventingsaid angles from being rubbed or cut off.

It consists, 'secondly,in the means for holding the sand-paper holder upon the molding with a yielding pressure, to enable it to conform more readily to the configuration of the molding.

In the accompanying drawing- A-A A is the frame of the machine, carrying the operating parts.

B is the sand-paper holder, hung -to the rod C, upon the top of the frame, in such a manner as to project over the side of the latter. It is composed of a metallic box, D, having its lower side removed, to receive the molding-blocks E, over which the sheets of sand;-

` papel' are stretched. 'These are retained within the holder by means of the clamping-screw, F, at its o/uter en Y lGr is atable, arranged upon the side of the frame, immediately beneath .the sand-paperv holder, and is designed to receive the molding to be polished. It is adapted for vertical adjustment upon the side of the frame by means of the Vertical hand-screws H working through nuts cast upon the back ofthe table, and extending within vertical slots, I, formed in the legs J of the frame, as shown.

The table is locked or secured in the desired position by means of thumb-nuts, K, upon screw-bolts which pass through vertical slots near each end of the table, as shown in iig. 2.

L represents a molding to be polished.

The blocks E,over which the sand-paper is stretched, must, together, conform in shape to the configuration of the molding, and dilferent sets of blocks must, of

, the sand-paper stretched over them, the paper would bear with such force upon the angle as to cut it off, and destroy the finish of the molding. To overcome this dilculty, the two blocks are employed, and two sheets of sand-paper, c o. The sheets are stretched, one over cach block, the two proximate sides or ends being clamped between said` blocks, and ltheir other ends between the shoulder d of the holder and the blocks c, which forms a bearing-surface for the set- Screw F.

By this construction, the sheets are firmly stretched over the blocks at f, and bear equally upon the molding upon each side of the angle a, without in the least cutting olf orrounding the latter. v

In the operation of polishing, the holder and blocks are adapted to slide-upon the rod O, reciprocatingrmotion being imparted to the same from the crank-shaft M,`through the medium of the connecting-rod N.

This shaft receives its motion from the main drivingshaft O, located at one end ofthe frame, through belts and pulleys, or by other` suitable means.

-. The polishing-blocks are heldupou the molding with la yielding pressure by means of the dat spring I?, pivoted at'one end to the center of the holder upon the upper surface, and at its opposite end' to the frame of the machine, as shown at y.

When it is desired to change the blocks, the end of i the spring is removed from the holder, and the latter swing upward upon the rod C.

The molding is fed forward beneath the vpolishingblocks by means of the wheels h h', located upon transverse shafts s s', one above the other, in front of the polishing-blocks.

'lhe upper roller h is encircled by an elastic band, to 'prevent the roller from marking or distiguring the molding.

, This roller is designed to operate as a pressureroller, and holds the molding upon the roller h', which is milled or toothed, to feed the work forward.

This latter roller works through a slot formed infthe table G, and is adjusted higher or lower, with said table, in the following manner:

'lhe 'shaft has its bearings at one end in the block Q, which is adapted for vertical movement in the upright7 Q', of the main frame, asshown in iig. 4.

The end of the shaft projecting through `this blockv is provided with a pinion, i, and immediately over it is located the pinion t', upon the shaft of the pressA vure-roller 71.

This latter shaft receives its, motion from the end shaft, R, of the main frame, through the medium of the belts and pulleys, as shown.

Now, as the shaft ofthe roller h is driven from the shaft of the upper roller, and as the former must be capable of adjustment vertically, it is', necessary that lthe m'edium for communicating motionfrom one to the purpose of regulating the motiorr of said roller.

Having thus described my invention,

What I claim as new, and desire to secure by Let ters Patent, ,is-

1. A sand-paper holder for polishing moldings, composed of two lor more blocks, held within a suitable clamping device, and 'over whose face the sand-paper is stretched, in such a manner as to conform to the. angles of the molding, to prevent the same from being cut or worn olfdu'ring the operation of' polishing, substantially as described.

2. The reciprocating sand-paperholder B, held upon the molding to be polished by means of the vibrating gpx-ding P, arranged as described, for the purpose speci- Witnesses:

G. H. FROST, D. I. POWERS.

FRANK G. CHAPMAN. 

